The Sika Deer (Cervus nippon) is a member of the deer family Cervidae that inhabits much of East Asia. It is found in mixed deciduous forests to the north, and mixed subtropical deciduous and evergreen forests to the south.

Sika deer are native to Taiwan to Japan, but they have been introduced to many parks in Europe. In the UK, there are large populations in Ireland and Scotland and there are patchy populations scattered across England.